28812736991 has 4 divisors (see below), whose sum is σ = 29356373592. Its totient is φ = 28269100392.

The previous prime is 28812736963. The next prime is 28812737021. The reversal of 28812736991 is 19963721882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28812736991 - 2¹⁰ = 28812735967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28812736951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271818221 + ... + 271818326.

It is an arithmetic number, because the mean of its divisors is an integer number (7339093398).

Almost surely, 2^28812736991 is an apocalyptic number.

28812736991 is a deficient number, since it is larger than the sum of its proper divisors (543636601).

28812736991 is an equidigital number, since it uses as much as digits as its factorization.

28812736991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543636600.

The product of its digits is 2612736, while the sum is 56.

The spelling of 28812736991 in words is "twenty-eight billion, eight hundred twelve million, seven hundred thirty-six thousand, nine hundred ninety-one".